Version 16.0 is allowing you to update the project percent complete attribute in the New User Experience (UX), even when the calculation mode is equal to "duration", which means that the calculation is done through the update % complete routine. As a default, the % complete attribute should turn to read-only for Effort or Duration % Complete calculation methods.
This issue doesn't happen on the classic interface
STEPS TO REPRODUCE:
Expected Results: The % Complete field is uneditable.
Actual Results: The % Complete field is editable
Release : 15.9.1, 15.9.2, 15.9.3, 16.0
Component : CLARITY PROJECT MANAGEMENT
Defect DE63784 is FIXED in 16.0.2